Hot-air furnace.



(No Modl.)

M. B. RUST.

HOT AIR FURNACE.

(Application filed .Feb. 18. 1901.)

Patented Dec. l0, I90L- 2 Sheets-Shoat I. v

' INVENT OR 04 TTORNE Y.

No. 688,549. Patented Dec. 10, MM.

M. R. RUST.

HUT AIR FURNACE.

(Application filed Feb. 18, 1901,) (No Model.) ,2 Sheeis$heot 2.

Mam I INVENT OR WITNESSES:

the sets of branch UNITED STATES PATENT OFFICE.

MORTIMER R. RUST, OF FULTON, NEW YORK.

HOT-AIRFURNACE.

SPECIFICATION forming part of IiettersI'atent No. 688,549, dated December 10, 1901. Application filed'I'ebrnary 18 1901. Serial No. 47,894. (No model.)

' zen of the United States, and a resident of Fulton, in the county of Oswego, in the State of New York, have invented new and useful Improvementsin Hot-Air Furnaces, of which the following, taken in connection with the ac.- companying drawings, is a full, clear, and exact description.

The object of this invention is to provide a hot-air furnace in which simplicity of construction shall be combined with great durability and great efficiency; and to that end the invention consists in the novel construction and combination of the component parts of the furnace hereinafter described, and set forth in the claims.

In the annexed drawings, Figure 1 is a front elevation of a hot-air furnace embodying my invention. Fig. 2 is a front View of the furnace bared of its jacket. Fig. 3 is a g orizontal transverse section on line X X in ig. 1. furnace with portions removed to better illustrate the construction of the dome. Figs. 5 and 6 are respectively detached front and inverted plan views of one of the branch flues. Fig. 7 is a side view of a portion of one of flues, showing their attachmentto the dome; and Fig. 8 is a vertical section on line Y Yin Fig. 7.

Similar letters of reference indicate corresponding parts.

A represents the jacket which incloses the furnace proper and has the usual hot-air pipes O 0 extending from it to the apartments of the building to be heated.

B denotes the fire-pot, which is provided with a suitable fire-grate D. I preferably form this fire-pot approximately square or rectangular in horizontal cross-section for the purpose hereinafter explained.

(t represents the door through which to introduce the fuel into the fire-pot.

1) represents the water-pan, hung on the exterior of the fire-pot, to supply the requisite moisture to the air heated within the jacket A.

0 denotes the ash-pit door.

The top of the fire-pot is formed with an outwardly-projecting ledge (1, extending completely around the walls of the fire-pot. Upon this ledge is seated the dome e, which is cor- Fig. 4 is a perspective View of the respondin gl y square or rectangular shaped in orlzontal cross-section and is formed with two of its oppositely-disposed walls, preferably' the side walls e, converging or inwardly inclined. The end walls of the dome are pr'eferably formed vertical, and one of these end walls-is provided with a feed-door a. Each of the aforesaid side walls 6 of the dome is provided with a plurality of openings ff,

preferably of the form of parallel slots, ex-

tending through the greater portion of the height of the wall 6. The slots of the two walls communicate with separate sets of branch flues g g, which are rectangular in cross-section and are seated on the inclined walls 6 around the slots f f, so as to communicate with the interior the said slots. By means of suitable clamps t', bolted to the dome and engaging flanges on the exteriors of the branch flues g g, said flues arefastened in their requisite positions. These branch flues extend laterally and upwardly from the exterior of the dome and are formed convergent or of gradually-diminish- .ing depth toward their free ends, and thus gradually reduce the heating-surfaces of the furnace in accordance with the increasingdistance of said surfaces from the fire-pot. The said branch fiuesaredisposed properdistances apart to form air-passages 71. between them.

' The free end of each of said fines is provided at opposite sides with openings j, and at said openings are thimbles Z Z, interposed between the fines and forming communicating connections which receive the products of combustion from the fines. To the thimbles on corresponding ends of the two sets of flues are connected smoke-fines Z, leading to the exit-pipe P.

n 'n are removable caps applied to holes in the front plate of the jacket A, said holes being in range with the two rows of thimbles Z to afiord access to the interiors of said thimbles for cleaning them.

lpreferably form the jacket A of separate walls composed of metal plates joined to each other at their vertical edges by means of clamps t i, placedastride the joints of the of the dome through walls at their inner and outer sides and fastened thereon by means of bolts t, passing through the clamps t t, between the the Walls, and provided with nuts for tightedges of the branch fines at the openings thereof, and

ening said clamps, as shown in Fig. 3 of the drawings. Said construction of the jacket dispenses with time and expense of riveting the plates together and permits the walls of the jacket to be readily removed for repairs or other purposes.

In order to effectually equalize the circulation of the products of combustion through the branch fines g g and to guard against excessively free passage of the products of combustion to the exit-pipe, I form the interior of each of said tines with a contracted throat 3, adjacent to the openings Vhat I claim as my invention is-- 1. The combination with the fire-pot, jacket and hot-air pipes extending from said jacket, of a dome mounted on the fire-pot and formed rectangular in horizontal cross-section and with two of its opposite walls inclined inwardly, separate sets of branch tlues extending laterally from said inclined walls and provided with openings in opposite sides of their free ends, thimbles interposed between the exit-pipe communicating with said thimbles as set forth and shown.

2. The combination with the fire-pot, jacket and hot-air pipes extending from said jacket, 1

of a dome mounted on the fire-pot and formed with two otitsopposite walls inclined inwardly and provided in each of' said walls with slots extending through the greater portion of the height of the walls, branch fines shaped rectangular in cross-section and seated upon the inclined walls around the slots thereof and extending laterally and upwardly therefrom with gradually-diminishing depth of the fines and each provided in opposite sides of its free end with openings, thimbles interposed between the branch flues at the openings thereof, and the exit-pipe communicating with said thimbles as set forth and shown.

3. In combination with the fire-potand superposed dome, the branch fines extending from said domeand provided in the sides of their free ends with openings and with contracted throats adjacent to said openings, thimbles interposed between the branch fiues at the aforesaid openings, and the exit-pipe communicating with said thimbles as set forth.

MORTIMER R. RUST.

Vitnesses:

J. J. LAASS, II. B. SMITH. 

